My recommendation is for your team to read:
The Inner Game of Tennis. W. Timothy Gallwey, 1974. Random House: New York, NY. Paperback Edition – Random House: New York, NY, 2008.
This is the book that I go through with my captain (captains) every year.
The Team Captain’s Leadership Manual. Jeff Janssen, 2004. Winning the Mental Game: Cary, NC.
You may want to pick excerpts from one of these two books to give to your team:
Talent is Never Enough – – Discover the Choices That Will Take You Beyond Your Talent. John C. Maxwell, 2007. Thomas Nelson Publishers: Nashville, TN.
The Talent Code – Greatness Isn’t Born. It’s Grown. Here’s How. Daniel Coyle, 2009. Bantam Dell, division of Random House: New York, NY.
My suggested readings for you:
InSideOut Coaching. Joe Ehrmann (with Paula Ehrmann and Gregory Jordan), 2011. Simon & Schuster: New York, NY.
Play Practice-2nd Edition: Engaging and Developing Skilled Players from Beginner to Elite
Alan G. Launder, 2013. Human Kinetics Publishers: Champaign, IL. (First Edition, 2001).
Best wishes,
Terry